-educated i.t. executive was chosen by a majority of national coalition members in istanbul. in his first speech, he ruled out dialogue with the shock assad's regime. government troops and rebel fighters are blaming each other for a chemical attack near the northern city of aleppo -- dialogue with bashar alabama assad's regime. >> they accuse rebel fighters of launching a missile containing poisonous gases. the information minister said this type of weapon was prohibited under international law. >> so far, we have 16 martyrs and 86 wounded. most of them are in critical condition. the chemical contained in the missile causes immediate fainting, convulsion, and that. >> in istanbul, syria's main opposition group said they were looking at the attack rejected allegations that rebels were involved. we also know the rebels do not have access to chemical weapons. they would not have access to the means of launching these kind of chemical weapons. >> we have no details yet. we are against using chemical weapons from any side. i am not expecting the revolutionaries to do that, but we